Get test running scripts to detect and report common error.

testing/tools/run_corpus_tests.py

 #!/usr/bin/env python
 # Copyright 2015 The PDFium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import optparse
 import os
 import re
 import shutil
 import subprocess
 import sys
 
 import common
 import pngdiffer
 import suppressor
 
 # Nomenclature:
 #   x_root - "x"
 #   x_filename - "x.ext"
 #   x_path - "path/to/a/b/c/x.ext"
 #   c_dir - "path/to/a/b/c"
 
 def test_one_file(input_filename, source_dir, working_dir,
                   pdfium_test_path, image_differ):
   input_path = os.path.join(source_dir, input_filename)
   pdf_path = os.path.join(working_dir, input_filename)
   try:
     shutil.copyfile(input_path, pdf_path)
     sys.stdout.flush()
+    if not os.path.exists(pdfium_test_path):

[Tom Sepez, 2015/05/20 23:24:38]

This should move to line 49, so we do it once and not on every file to process.

+      print "FAILURE: Can't find test executable '%s'" % pdfium_test_path
+      print "Use --build-dir=out\\Release"

[Tom Sepez, 2015/05/20 23:24:38]

nit: there may be other build dirs besides just out/release, depending on how
clever the developer has been.  So maybe say
"Use the -build-dir option to search alternate locations"
or some such.

+      sys.exit(10)
     subprocess.check_call([pdfium_test_path, '--png', pdf_path])
   except subprocess.CalledProcessError as e:
     print "FAILURE: " + input_filename + "; " + str(e)
     return False
   if image_differ.HasDifferences(input_filename, source_dir, working_dir):
     return False
   return True
 
 def main():
   parser = optparse.OptionParser()
@@ skipping 28 matching lines @@
     print '\n\nSummary of Failures:'
     for failure in failures:
       print failure
     return 1
 
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())